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Neurophysiology
UCCS Bio 2010 Lykins- Lab Practical 4, Ex. 16
9
Anatomy
Undergraduate 1
12/08/2013

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Term
neuron excitability vs. conductibility
Definition
they respond to stimuli by producing an electrical signal vs. they communicate by sending electrical signals
Term
resting membrane potential
Definition
the difference in the slightly more negatively-charged interior of a resting neuron from the exterior surface that produces an electrical charge
Term
depolarization
Definition
the interior of the membrane of a cell becoming less negative after it receives an excitatory stimulus that makes it more permeable to Na+
Term
repolarization
Definition
membrane permeability to Na+ falls and increases to K+, so the interior of the membrane once again becomes more negative than the exterior
Term
hyperpolarization
Definition
the period during repolarization when the charge goes below the rmp
Term
all-or-none principle
Definition
an a.p. is always the same (constant amplitude and duration), it is never partially transmitted or smaller if a stimulus is smaller
Term
absolute refractory period
Definition
a time when the neuron is insensitive to further stimulus and cannot generate another a.p.
Term
relative refractory period
Definition
as Na+ permeability is gradually being restored to normal, an especially strong stimulus may provoke another a.p.
Term
sodium-potassium pump
Definition
maintains the concentration differences of Na+ and K+ across the membrane that are needed for normal function by pumping 3 Na+ out and 2 K+ in (b/c Na+ leaks in and K+ leaks out)
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